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1. In which of the listed terms/conditions will increase the speed of synchronous motor?

 
 
 
 

2. Sparking of a DC motor can be attributed to ___________.

 
 
 
 

3. The maximum allowable primary current of a 2KVA step-down transformer with a four to one turns ratio if connected across a 440 volt line is __________.

 
 
 
 

4. Which of the following statements is true concerning the operating characteristics of a squirrel-cage motor?

 
 
 
 

5. The ideal frequency of an incoming generator synchroscope pointer for closing the ACB is _______.

 
 
 
 

6. What is the importance of a substance with high retentivity?

 
 
 
 

7. Since steering gear motor does not have an over current trip protection, the only main circuit protection is from the back-up fuses which are essential for ____________.

 
 
 
 

8. An electric device which employs stationary armature and a rotating electromagnetic field is used aboardship as a ____________.

 
 
 
 

9. An alternator shall be protected from running like a motor because of possible_______________.

 
 
 
 

10. The RMS (root mean square also known as quadratic mean) value of a sine-wave current may also be expressed as the ____________.

 
 
 
 

11. Which of the following starting system cannot start the motor on its own, instead different ways are used such as using a winding at the stator for auxiliary phase starting?

 
 
 
 

12. The ideal in-service temperature of a running electric motor bearing is _______________.

 
 
 
 

13. When a megohmeter is connected to each end of an individual motor winding and low ohm reading is indicated, it means __________.

 
 
 
 

14. In a series circuit, which of the following values will remain unchanged at all places in the circuit?

 
 
 
 

15. A resistance of 3.3 Mohms is connected across a 500 V source. The resulting current is approximately ___________.

 
 
 
 

16. What will happen if the field circuit of a loaded shunt motor is suddenly opened?

 
 
 
 

17. What is governor sensitivity?

 
 
 
 

18. A thermocouple instrument can be used on ________.

 
 
 
 

19. Aside from an automobiles, where would most likely be found a lead-acid battery?

 
 
 
 

20. The change from star connection to delta connection during start up of star-delta motor is controlled by a _______.

 
 
 
 

21. In case of blackout or loss of power supply from shore, at least how many of the vessel’s generator shall be automatically started and connected to the main switchboards?

 
 
 
 

22. A law stating that the strength of the force exerted by two charged objects depends on the strength of the charges and on the distance between them __________.

 
 
 
 

23. The 24 volt DC bus on the emergency switchboard is used to supply power to the ___________.

 
 
 
 

24. Electric cables are formed of stranded wire to ____________.

 
 
 
 

25. When a megohmmeter is used to test insulation, the gradual rise of the pointer reading as a result of continued cranking, is caused by ____________.

 
 
 
 

26. Regarding an induction motor, the power developed by the rotor automatically adjusts itself to the ____________.

 
 
 
 

27. What do you call a signal derived from a controlled function and returned to the initiating point?

 
 
 
 

28. A transformer in an electric circuit serves to _____________.

 
 
 
 

29. Which of the following characteristics is most critical in determining the size of the cable to be used in a particular circuit?

 
 
 
 

30. Which of the following characteristics is most critical in determining the size of the cable to be used in a particular circuit?

 
 
 
 

31. As load is added to a shunt motor, the motor will ________________.

 
 
 
 

32. The resistance value of a resistor in a circuit can be best determined by ______________.

 
 
 
 

33. The ideal in-service temperature of a running electric motor bearing is _______________.

 
 
 
 

34. To prevent the generator windings from absorbing moisture while at standstill, what is this device being fitted?

 
 
 
 

35. When the synchroscope pointer rotates in a fast direction (clockwise), it indicates that the governor frequency of incoming generator is ______________.

 
 
 
 

36. The ideal frequency of an incoming generator synchroscope pointer for closing the ACB is _______________.

 
 
 
 

37. In order to protect the generator in service from overload, the non-essential load is isolated from the system by which of the following devices?

 
 
 
 

38. When the non-essential load has been removed from the feeder system but the service generator remains overloaded, this device is automatically activated _____________.

 
 
 
 

39. When using a megohmmeter to test insulation, good insulation will be indicated by _____________.

 
 
 
 

40. The mica used in the commutators of DC machinery is _____________.

 
 
 
 

41. Which of the following conditions include possible phase relationships between voltage and current in an alternating current circuit?

 
 
 
 

42. Basic electrical motor action depends on _____________.

 
 
 
 

43. The speed of a squirrel-cage induction motor is determined by the ______________.

 
 
 
 

44. Which of the following statements is true concerning the operating characteristics of a squirrel-cage motor?

 
 
 
 

45. Magnet chatter or "pumping" occurring in a magnetic contactor can be caused by ____________.

 
 
 
 

46. The 24 volt DC bus on the emergency switchboard is used to supply power to the ______________.

 
 
 
 

47. Transistors and FETS are primarily used for _______________.

 
 
 
 

48. Which of the following types of insulation will begin to deteriorate first as a result of heat generated in the conductor it surrounds?

 
 
 
 

49. Which of the following is a disadvantage of using a semiconductor?

 
 
 
 

50. A component, which is made of semiconductor material, is often called ______________.

 
 
 
 

51. The forward and reverse resistance of a transistor is getting opposite reading. It means the transistor is _______________

 
 
 
 

52. High power zener diodes are usually _____________.

 
 
 
 

53. The Zener diode symbol is similar to the PN junction diode but its bar is shaped like a ______________.

 
 
 
 

54. Because of its high speed switching capabilities, the PIN diode is normally has sealed metal cases which serves as _____________.

 
 
 
 

55. On an engine throttle control system, the auxiliary control circuits are provided with devices to prevent excessive over travel of the pilot valve by the synchronous motor. These devices are called __________.

 
 
 
 

56. In a schematic, what part of the diode is characterized by a wide end arrow?

 
 
 
 

57. You have an unknown type of diode in a circuit. You measure the voltage across it and find it to be 0.3 V. The diode might be ____________.

 
 
 
 

58. You have an unknown type of diode in a circuit. You measure the voltage across it and find it to be 0.7 V. The diode might be ____________.

 
 
 
 

59. You have an unknown type of diode in a circuit. You measure the voltage across it and find it to be 0.2 V. The diode might be ____________.

 
 
 
 

60. What types of impurity atoms are added to increase the number of conduction-band electrons in intrinsic silicon?

 
 
 
 

61. What factors does the barrier potential of a PN junction depend on?

 
 
 
 

62. Reverse breakdown is a condition in which the diode __________.

 
 
 
 

63. There is a small amount of current across the barrier of a reverse-biased diode. What is this current called?

 
 
 
 

64. What will happen to the voltage across the diode when the forward current through a silicon diode increases?

 
 
 
 

65. A silicon diode is forward-biased. You measure the voltage to ground from the anode at ________, and the voltage from the cathode to ground at ________.

 
 
 
 

66. A common-gate amplifier is similar in configuration to which BJT amplifier?

 
 
 
 

67. What is the theoretical efficiency of a Class D amplifier?

 
 
 
 

68. A common-source amplifier is similar in configuration to which BJT amplifier?

 
 
 
 

69. What are the reasons why MOSFETs make better power switches than BJTs?

 
 
 
 

70. What are the reasons why MOSFETs make better power switches than BJTs?

 
 
 
 

71. What are the reasons why MOSFETs make better power switches than BJTs?

 
 
 
 

72. MOSFET digital switching is used to produce which digital gates? I. Inverters II. NAND gates III. NOR gates

 
 
 
 

73. Why is Class D amplifiers different from all other classes of amplifiers?

 
 
 
 

74. Which FET amplifier(s) has (have) a phase inversion between input and output signals?

 
 
 
 

75. What does a high resistance reading in both forward- and reverse-bias directions indicate?

 
 
 
 

76. What is the state of an ideal diode in the region of non-conduction?

 
 
 
 

77. At what kind of operating frequency diffusion or transition is a capacitor represented in parallel with the ideal diode?

 
 
 
 

78. Which of the following devices can check the condition of a semiconductor diode? I.Curve tracer II. Digital display meter III. Multimeter

 
 
 
 

79. Which of the following elements is most frequently used for doping pure Ge or Si? I.Arsenic II.Boron III.Aluminum

 
 
 
 

80. Which of the following elements used for doping pure Ge or Si are atom donors? I. Arsenic II.Boron III.Phosphorus

 
 
 
 

81. Which of the following elements used for doping pure Ge or Si are atom acceptors? I.Arsenic II.Aluminum III.Boron

 
 
 
 

82. Which of the following ratings is true regarding Germanium diode and Silicon diode?

 
 
 
 

83. Which of the following ratings is true regarding Germanium diode and Silicon diode?

 
 
 
 

84. Which capacitance dominates in the forward-bias region?

 
 
 
 

85. What is another term for feeder circuit breakers?

 
 
 
 

86. Low horsepower, polyphase induction motors can be started with full voltage by means of ___________.

 
 
 
 

87. What is the common type of AC motor used onboard which can also operates on direct current?

 
 
 
 

88. Universal motors will operate on AC or DC current and are generally found in _____________.

 
 
 
 

89. The life expectancy of electrical insulation, is approximately halved ro an increased operating temperature of ___________.

 
 
 
 

90. Combined effect of inductive reactance, capacitive reactance and resistance in an AC series circuit is known as ____________.

 
 
 
 

91. When the synchroscope pointer rotates in a fast direction (clockwise), it indicates that the governor frequency of incoming generator is ______________.

 
 
 
 

92. A commutator protective oxide film can be destroyed by ____________.

 
 
 
 

93. One function of the movable cams in a drum-type motor controller is to ____________.

 
 
 
 

94. Choose from the equipment below which one is NOT fitted to the generator trouble detecting system _______________.

 
 
 
 

95. The speed of a squirrel-cage induction motor is determined by the ______________.

 
 
 
 

96. How is a wattmeter electrically connected in a circuit?

 
 
 
 

97. How are the three-phase voltages in a three-phase circuits arranged?

 
 
 
 

98. UMS requirements demand that a standby main generator starts auto¬matically in case of failure of the service generator. The standby generator is to start and close onto the dead bus bars within ____________.

 
 
 
 

99. What is the approximate resistance setting of a rheostat in which a 650mA of current flows with a 150V source?

 
 
 
 

100. The most common source of excitation for synchronous motors is a /an _____________.

 
 
 
 

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